New self sensing scheme based on INFORM, heterodyning and Luenberger observer

Self sensing techniques for AC machines has been a research topic for almost two decades. Two promising methods are found in Injection of high frequency carrier [1-8] and the INFORM method [9-13]. Booth schemes are based on utilization of saliency in order to make position estimate. The excitation and signal processing for these methods differs. A new scheme based on the INFORM measurements a tracking observer found in [1-6] is presented. The new scheme gives the modified INFORM method a dose to zero phase lag in rotor position estimate. The new scheme 6 implemented and evaluated with a 32 kW IPMSM.